内生定数感应调节微生物的社会行为,用于无氧消化适应温度降低的消化
Yifan Zhang1, Mingting Xie1, Jiaming He1
1College of Life Sciences, Henan Agricultural University, No.63 Agricultural Road, Zhengzhou, 450002, People's Republic of China.
Environmental microbiome
|February 10, 2026
概括
内生定数感应 (QS) 分子,特别是AHL和AI-2,使废水处理系统能够适应低温. 这种适应通过调节微生物群落和细胞外聚合物质 (EPS) 来保持高效的性能.
科学领域:
- 环境微生物学 环境微生物学
- 生物技术是生物技术.
- 废水处理工程 废水处理工程
背景情况:
- 介质性无氧消化 (AD) 对于废水处理是有效的,但对30-40°C以外的温度敏感.
- 低温对AD性能,微生物群落和颗粒型污泥的特性产生负面影响.
- 关于在压力下增强AD的研究集中在外源的定数感知 (QS) 分子上,对内源的QS的研究有限.
研究的目的:
- 为了研究微生物应激适应介于内源的质量系统在一个上游无氧污泥毯 (UASB) 反应堆的逐步降温期间介导的微生物应激适应.
- 分析温度逐渐降低 (35°C至20°C) 对反应堆性能,微生物群落结构和颗粒性污泥特性的影响.
- 阐明内源QS分子在促进低温应激下适应和恢复中的作用.
主要方法:
- 一个UASB反应堆的运行,温度从35°C降低到20°C.
- 监测化学氧需求 (COD) 清除效率和其他性能指标.
- 使用分子技术分析微生物群体结构 (细菌和古物) 和颗粒型污泥特性.
- 通过Mantle测试对QS分子 (AHL和AI-2) 的量化和分析以及它们与微生物和污泥特征的相关性.
主要成果:
- 在调整后,UASB反应器在20°C时也保持了稳定的COD去除效率 (78-79%).
- 温度降低导致微生物群落的变化,蛋白质细菌在较低的温度下占主导地位; 形虫和克里斯氏菌R-7表现出高适应性.
- 观察到甲生路径从乙类 (由甲类占主导地位) 转变为类 (增加了甲菌和甲螺旋菌).
- 发现内源生成的AHLs和AI-2对于优化细菌和甲原体社区至关重要,促进更快的污泥回收.
结论:
- 内生QS分子 (AHLs和AI-2) 是微生物行为和在温度压力下细胞外聚合物质 (EPS) 生产的关键调节者.
- QS信号影响EPS组成 (PN/PS比),促进细菌粘附,稳定污泥颗粒并维持新陈代谢功能.
- 通过QS介导的适应增强了心理友好的无氧消化,支持在较冷的气候中节能处理废水,并提高对低温对无氧系统影响的理解.
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